ATI RN
Questions About the Nervous System Questions
Question 1 of 5
Neuron A has a diameter that is twice that of Neuron B. Based only on this information, which of the following is true?
Correct Answer: C
Rationale: Larger diameter axons (Neuron A) have lower resistance, transmitting action potentials faster. Strength is all-or-none, not diameter-dependent.
Question 2 of 5
Neurons that transmit nerve impulses from receptors to the central nervous system are neurons.
Correct Answer: C
Rationale: Sensory neurons (afferent) transmit impulses from receptors to the CNS. Interneurons connect within the CNS, motor neurons (efferent) signal effectors, and unipolar is a structural type.
Question 3 of 5
The myelin sheath around axons in the CNS is formed by
Correct Answer: C
Rationale: Oligodendrocytes form myelin sheaths around CNS axons. Schwann cells myelinate PNS axons, neurons conduct, and 'none' is incorrect.
Question 4 of 5
The return of the neuron cell membrane to resting potential is called
Correct Answer: D
Rationale: Repolarization restores resting potential (~-70 mV) via K+ efflux after depolarization. Synaptic transmission is communication, polarization is resting, and depolarization is Na+ influx.
Question 5 of 5
Cerebrospinal fluid is located between the and the
Correct Answer: C
Rationale: CSF fills the subarachnoid space between the arachnoid mater and pia mater, providing cushioning.